feat: integrate enakgame and voucher

lib/domain/wallet/entities/voucher_entity.dart

@@ -0,0 +1,72 @@
+part of '../wallet.dart';
+
+/// Voucher di katalog yang bisa ditukar dengan EnakPoint sekarang (§9.1).
+@freezed
+abstract class Voucher with _$Voucher {
+  const Voucher._();
+
+  const factory Voucher({
+    required String id,
+    required String name,
+    String? description,
+    String? imageUrl,
+    required VoucherType type,
+
+    /// Nilai voucher dalam rupiah.
+    required int faceValue,
+
+    /// EnakPoint yang dipotong saat ditukar.
+    required int pointCost,
+
+    /// Batas tukar per customer; `null` berarti tanpa batas.
+    int? maxPerCustomer,
+    DateTime? validUntil,
+
+    /// Sisa stok; `null` berarti stok tidak dihitung.
+    int? available,
+  }) = _Voucher;
+
+  bool get isOutOfStock => available != null && available! <= 0;
+}
+
+/// Voucher hasil tukar milik customer (§9.3).
+@freezed
+abstract class VoucherRedemption with _$VoucherRedemption {
+  const factory VoucherRedemption({
+    required String id,
+    required String voucherId,
+    required String voucherName,
+    String? voucherImageUrl,
+    required VoucherType voucherType,
+    required VoucherRedemptionStatus status,
+    required int faceValue,
+    required int pointCost,
+
+    /// `null` bila voucher tidak memakai kode; customer menunjukkan layar
+    /// voucher ke kasir.
+    String? code,
+    DateTime? codeExpiresAt,
+    DateTime? completedAt,
+    DateTime? createdAt,
+  }) = _VoucherRedemption;
+}
+
+@freezed
+abstract class VoucherRedemptionPage with _$VoucherRedemptionPage {
+  const factory VoucherRedemptionPage({
+    required List<VoucherRedemption> items,
+    required int page,
+    required int totalPages,
+  }) = _VoucherRedemptionPage;
+}
+
+@freezed
+abstract class VoucherRedeemResult with _$VoucherRedeemResult {
+  const factory VoucherRedeemResult({
+    required VoucherRedemption redemption,
+
+    /// Saldo EnakPoint setelah ditukar.
+    required int pointBalance,
+    required bool replayed,
+  }) = _VoucherRedeemResult;
+}